RERI and 95% CI for different units increase in serum ferritin (20, 50 and 100 μg/L) and BMI (2, 3, 4 and 5 kg/m2)
| RERI (95% CI) | SF (μg/L) | ||
|---|---|---|---|
| 20 | 50 | 100 | |
| BMI (kg/m2) | |||
| 2 | 0.106 | 0.314 | 1.186 |
| 0.011 to 0.417 | 0.026 to 1.506 | 0.090 to 8.285 | |
| 3 | 0.118 | 0.596 | 2.126 |
| 0.006 to 0.544 | 0.057 to 2.933 | 0.156 to 15.683 | |
| 4 | 0.209 | 0.930 | 3.240 |
| 0.018 to 0.982 | 0.097 to 5.025 | 0.260 to 27.606 | |
| 5 | 0.462 | 1.559 | 4.559 |
| 0.052 to 2.034 | 0.147 to 8.530 | 0.309 to 38.090 | |
BMI, body mass index; RERI, relative excess risk due to interaction; SF, serum ferritin.